Re: but ??

I agree, T2, ... unless there is substantial fat reserve.
E.g. with only 15 kg of fat, I would never dare to go beyond 30-40 days. And true: intuitively a 17 year old most probably needs something like 17-25 day fast, at most, to clean the body. I read advices in the line of "a day of Water Fast for every year of abused health".